Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van dinh » van minh, van dich, va dinh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
vu dinh » quy dinh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang x) or (nang cao)) hoi. hieu va cao xuc ((vu dinh) or (van dinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang x) OR (nang cao)) hoi. hieu va cao xuc ((vu dinh) OR (van dinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang x) or (nang cao)) hoi. hieu va cao xuc ((vu dinh) or (van dinh)) vi cua tre*.